use pointers

src/comm/comm.go

@@ -15,8 +15,23 @@ type Comm struct {
 	connection net.Conn
 }
 
+func (c *Comm) IsClosed() bool {
+	one := []byte{}
+	c.connection.SetReadDeadline(time.Now())
+	_, err := c.connection.Read(one)
+	if err != nil {
+		fmt.Println(err)
+		c.connection.Close()
+		c.connection = nil
+		return true
+	} else {
+		c.connection.SetReadDeadline(time.Now().Add(3 * time.Hour))
+	}
+	return false
+}
+
 // NewConnection gets a new comm to a tcp address
-func NewConnection(address string) (c Comm, err error) {
+func NewConnection(address string) (c *Comm, err error) {
 	connection, err := net.DialTimeout("tcp", address, 3*time.Second)
 	if err != nil {
 		return
@@ -26,24 +41,26 @@ func NewConnection(address string) (c Comm, err error) {
 }
 
 // New returns a new comm
-func New(c net.Conn) Comm {
+func New(c net.Conn) *Comm {
 	c.SetReadDeadline(time.Now().Add(3 * time.Hour))
 	c.SetDeadline(time.Now().Add(3 * time.Hour))
 	c.SetWriteDeadline(time.Now().Add(3 * time.Hour))
-	return Comm{c}
+	comm := new(Comm)
+	comm.connection = c
+	return comm
 }
 
 // Connection returns the net.Conn connection
-func (c Comm) Connection() net.Conn {
+func (c *Comm) Connection() net.Conn {
 	return c.connection
 }
 
 // Close closes the connection
-func (c Comm) Close() {
+func (c *Comm) Close() {
 	c.connection.Close()
 }
 
-func (c Comm) Write(b []byte) (int, error) {
+func (c *Comm) Write(b []byte) (int, error) {
 	header := new(bytes.Buffer)
 	err := binary.Write(header, binary.LittleEndian, uint32(len(b)))
 	if err != nil {
@@ -62,7 +79,7 @@ func (c Comm) Write(b []byte) (int, error) {
 	return n, err
 }
 
-func (c Comm) Read() (buf []byte, numBytes int, bs []byte, err error) {
+func (c *Comm) Read() (buf []byte, numBytes int, bs []byte, err error) {
 	// read until we get 5 bytes
 	header := make([]byte, 4)
 	n, err := c.connection.Read(header)
@@ -99,13 +116,13 @@ func (c Comm) Read() (buf []byte, numBytes int, bs []byte, err error) {
 }
 
 // Send a message
-func (c Comm) Send(message []byte) (err error) {
+func (c *Comm) Send(message []byte) (err error) {
 	_, err = c.Write(message)
 	return
 }
 
 // Receive a message
-func (c Comm) Receive() (b []byte, err error) {
+func (c *Comm) Receive() (b []byte, err error) {
 	b, _, _, err = c.Read()
 	return
 }

src/tcp/tcp.go

@@ -14,8 +14,8 @@ import (
 const TCP_BUFFER_SIZE = 1024 * 64
 
 type roomInfo struct {
-	first  comm.Comm
-	second comm.Comm
+	first  *comm.Comm
+	second *comm.Comm
 	opened time.Time
 	full   bool
 }
@@ -77,7 +77,7 @@ func run(port string) (err error) {
 	}
 }
 
-func clientCommuncation(port string, c comm.Comm) (err error) {
+func clientCommuncation(port string, c *comm.Comm) (err error) {
 	// send ok to tell client they are connected
 	log.Debug("sending ok")
 	err = c.Send([]byte("ok"))
@@ -134,7 +134,7 @@ func clientCommuncation(port string, c comm.Comm) (err error) {
 	wg.Add(1)
 
 	// start piping
-	go func(com1, com2 comm.Comm, wg *sync.WaitGroup) {
+	go func(com1, com2 *comm.Comm, wg *sync.WaitGroup) {
 		log.Debug("starting pipes")
 		pipe(com1.Connection(), com2.Connection())
 		wg.Done()
@@ -153,6 +153,7 @@ func clientCommuncation(port string, c comm.Comm) (err error) {
 	log.Debugf("deleting room: %s", room)
 	rooms.rooms[room].first.Close()
 	rooms.rooms[room].second.Close()
+	rooms.rooms[room] = roomInfo{first: nil, second: nil}
 	delete(rooms.rooms, room)
 	rooms.Unlock()
 	return nil

src/tcp/tcp_test.go

@@ -20,6 +20,7 @@ func TestTCP(t *testing.T) {
 	_, err = ConnectToTCPServer("localhost:8081", "testRoom")
 	assert.NotNil(t, err)
 
+	assert.False(t, c1.IsClosed())
 	// try sending data
 	assert.Nil(t, c1.Send([]byte("hello, c2")))
 	data, err := c2.Receive()
@@ -32,14 +33,13 @@ func TestTCP(t *testing.T) {
 	assert.Equal(t, []byte("hello, c1"), data)
 
 	c1.Close()
+	assert.True(t, c1.IsClosed())
+
 	time.Sleep(200 * time.Millisecond)
-	err = c2.Send([]byte("test"))
-	assert.Nil(t, err)
-	_, err = c2.Receive()
-	assert.NotNil(t, err)
+	assert.True(t, c2.IsClosed())
 }
 
-func ConnectToTCPServer(address, room string) (c comm.Comm, err error) {
+func ConnectToTCPServer(address, room string) (c *comm.Comm, err error) {
 	c, err = comm.NewConnection("localhost:8081")
 	if err != nil {
 		return